Reagent holder tube



FIG. 1 is a bottom perspective view of the reagent holder tube;

FIG. 2 is a top perspective view thereof;

FIG. 3 is bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a back view thereof; and,

FIG. 8 is a top view thereof. 

The ornamental design for a reagent holder tube, as shown and described. 